Oil-filled lead-bushing



J. J. FRANK.

OIL FILLED LEAD BUSHING.

APPLICATION FILED OCT. so. 1916.

1,304,469. Patented May 20, 1919.

\ a Q Q Inventor: John J. Frank His flttomeg outrun s ATES PATENT orrron.

JOHN J. FRANK, F PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A COREORATION OF NEW YORK.

OIL-FILLED LEAD BUSHING.

Specification of Letters Patent.

Patented May 20, 1919.

hyplieation filed october 30, 1918. Serial No. 128,428.

pound filled lend bushings to walls, like the casings inclosing electrical upperutus such as transformers, oil switches and the like.

Heretofore large high tension bushings of the type I have improved have been built up of various porcelain members, either separate or cemented together, and secured by iron or metal rods running through clamping members "placed above and below the porcelain members. Bushingswhen so built up and subject to widely changing ternperetures us occur when intermittent or iiuctouting; loads are carried by the electric, sppsrutus, are subject to severe internal strains due to the differential expansion of the metal and porcelain. ln consequence of these strains, the abutting porcelain members develop leaks and occasionally give way.

My improved mode of securing oil filled nd bushings voids these destructive us ziltogetl'ier because 1' employ 2i securr collar e teched to thebushing in such a. Inunner that it becomes substantially an integral part thereof.

u. more exact understanding" of my invention and the details thereof, reference may be had to the annexed drawing in which Figure shows, in elevation, it large oil filled bushingembodying my invention, while 2 is u larger detail view thereof, ports b mg broken or cut sway.

Referring now particularly to Fig. 1, 5 deno es the top wall of a transformer :using to which my improved. bushing is bolted by means of the iienge'd member 6;. My bushing consists of two porcelain insulating members '7 end 8 spaced spurt by and secured to the iron or metal sleeve of which sleeve the flanged member 6 may be and is here shown as an integral part.

In order to secure the insulating members 7 and 8 to the sleeve 9 in an oil-tight manner, I secure clun'iping rings 10 rigidly to the members 7 and 8 respectively, in any desired monner.'but preferably by cement 11, as shown in Fig. 2.

The ring 10 is secured to the flange G by nns of bolts 12, the gasket or packing 13 ring inserted so as to make an oil-tight joint.

To the upper end of the insulating member 7 is secured the clamping ring 1e in substantially the some manner as clamping ring 10. To ring lei the cup 16 is secured by means of bolts 15, and upon the cap is secured the glass or other transparent housing 17 above which is secured the capping nien'iber 18 in which the leading-in conductor 19 is secured in any convenient and approved manner.

The lower insulating member 8 is secured to sleeve 9 in substantially the same manner as is member 7 and is closed at its lower end by cap 20.

It will thus be seen that I have built up an insulating bushing in which the metal and porcelain parts are secured together in such a. manner as to be free from internal. strains and at the some time provide oiltight joints so that the bushing as a whole may be filled with oil or other insulating compound, without fear of leakage,

The glass housing 17 is adapted to serve as o gage glass to indicate whether the bushing contains sufficient oil or compound.

The flange 6 provides convenient means I for clamping the bushing to the .cover f with.

While I have described in detail the best means at present, known to, me for carrying out an embodiment of my invention, I would have it understood that I do not mean to be limitcdthereby in the choice of mechanical equivalents and the embodiment of means to an end except as'defined in the following claims.

invention and may be entirely dispensed sleeve What I claim as new and desire to secure by Letters Patent of the United States,- is:'

1. The combination with insulatingmembers, of a sleeve for spacing said members apart, clamping rings rigidly aflixed to said members, aiid'meansfor securing said rings 1 to said sleeve in an oil-tight manner.

2. The combination with a casing, of in c a sleeve provided with a adapted to space members having suiating members,

ange, said sleeve being said members apart, sa d clamping rings rigidly aflixed thereto and securing means for attaching said rings to said sleeve, and additional securing means for attaching said flange to said casing, all in an oil-tight manner.

1 3. Al oil or compound filled lead bushing comprising the combination With two insulating members havin clamping rings rigidly ailixed to their two ends,v of a spacing means for securing said rings to said and caps adapted to receive-a conducof sa d insusleeve,

tor secured to the outer ends lating members.

4. An oil filled tvne lead bushing commember secured thereto, lating member prising the combination 'with two insulating members having clamping rings cemented to their two ends, with a flange, to the ends of which the insulating members are secured in an oil-tight ductor secured in an oil-tight manner to the outer ends of said insulating members.

5. The combination with a casing, of a my hand thisQ iithday of October, 1916.

JOHN J. FRANK.

of a spacing sleeve provided 3U manner, and caps adapted to receive a conv provided with means M 

